docs: def classify_file(f):
      """Examine the column names to determine which type of file
      this is. Return a tuple:
      retvalue[0] = "file is non-parameterized"
      retvalue[1] = "file contains error column"
      """
      cols=f[1].columns
      if len(cols) == 2:
          #Then we must have a simple file
          return (True,False)
      elif len(cols) == 3 and ('ERROR' in cols.names):
          return (True,True)
      elif len(cols) > 2 and ('ERROR' not in cols.names):
          return (True,False)
      else:
          return (False,True)